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CMS Detector Performance Summaries

Derniers ajouts:
2021-09-28
16:19
A new approach for CMS RPC current monitoring using Machine Learning techniques /CMS Collaboration
Monitoring the stability of the RPC current is a tedious job where more than a thousand individual high voltage (HV) channels have to be analyzed. The current depends on several parameters (applied voltage, luminosity, environmental parameters, etc.), and sometimes it is not evident if it changes due to variation of external parameters or if it is due to a malfunction of the chamber. A Machine Learning approach is introduced to monitor and detect possible HV problems. [...]
CMS-DP-2021-023; CERN-CMS-DP-2021-023.- Geneva : CERN, 2020 - 22 p. Fulltext: PDF;

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2021-09-28
16:19
RPC Efficiency Results for Run-2 /CMS Collaboration
This note presents RPC efficiency 2D plots for the Run-2. The efficiency was obtained by applying the Tag-and-Probe method in a single-muon triggered dataset. [...]
CMS-DP-2021-022; CERN-CMS-DP-2021-022.- Geneva : CERN, 2020 - 15 p. Fulltext: PDF;

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2021-09-28
16:19
Performance comparison of CMS RPC system using cosmic rays data from end of Run-2 and end of LS2 /CMS Collaboration
This note presents a performance comparison of the CMS RPC system using data from cosmic rays recorded between the end of Run-2, in 2018, and the end of the second LHC long shutdown period (LS2), in 2021. After the extensive maintenance of power, gas and online systems that took place on LS2, we can see a significant gain in the efficiency and a cluster size compatible with Run-2..
CMS-DP-2021-021; CERN-CMS-DP-2021-021.- Geneva : CERN, 2021 - 7 p. Fulltext: PDF;

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2021-09-21
17:14
First Tracker Alignment results with 2021 cosmic ray data /CMS Collaboration
During the LHC Long Shutdown 2 (2018-2021) the CMS Barrel Pixel detector was disassembled and its innermost layer was fully replaced. In this report, performance plots of the first pixel-detector alignment results are presented, which were obtained with cosmic ray data taken prior to the re-start of the Run 3 LHC pp operations. [...]
CMS-DP-2021-025; CERN-CMS-DP-2021-025.- Geneva : CERN, 2021 - 8 p. Fulltext: PDF;

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2021-09-21
17:14
The Pixel Luminosity Telescope: A detector for luminosity measurements at CMS using silicon pixel sensors /CMS Collaboration
The Pixel Luminosity Telescope is a silicon pixel detector dedicated to luminosity measurement at the CMS experiment. It consists of 48 silicon sensor planes arranged into 16 "telescopes" of three planes each, with eight telescopes arranged around the beam pipe at either end of the CMS detector, outside the pixel endcap at a distance of approximately 1.75 m from the interaction point. [...]
CMS-DP-2021-020; CERN-CMS-DP-2021-020.- Geneva : CERN, 2021 - 46 p. Fulltext: PDF;

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2021-08-05
15:01
Analytical Method (AM) for DT Trigger Primitive Generation in Phase-2 /CMS Collaboration
A full replacement of the muon trigger system in the CMS (Compact Muon Solenoid) detector is envisaged for operating at the maximum instantaneous luminosities expected in HL-LHC (High Luminosity Large Hadron Collider) of about 5-7.5$\times10^{34}$ cm${}^{-2}$s${}^{-1}$. Under this scenario, the new on detector electronics that is being designed for the DT (Drift Tubes) detector will forward all the chamber information at its maximum time resolution. [...]
CMS-DP-2021-011; CERN-CMS-DP-2021-011.- Geneva : CERN, 2021 - 6 p. Fulltext: PDF;

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2021-07-27
18:18
Mass regression of highly-boosted jets using graph neural networks /CMS Collaboration
In this note a novel technique is presented, based on machine learning (ML), to reconstruct the mass of hadronically decaying highly Lorentz-boosted heavy particles with the CMS Phase 1 detector. The technique, commonly known as mass regression, is based on ParticleNet [1-3], a graph neural network using an unordered set of jet constituent particles as the input. [...]
CMS-DP-2021-017; CERN-CMS-DP-2021-017.- Geneva : CERN, 2021 - 13 p. Fulltext: PDF;

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2021-06-18
16:33
Validation of Physics Models of Geant4 10.7 using data from CMS Experiment /CMS Collaboration
In the simulation of the CMS experiment, a specific Geant4 physics configuration (Physics List), tuned with dedicated test beam experiments, is used. Test beam data provide measurements of energy response of the calorimeter as well as resolution for well identified charged hadrons over a large energy region. [...]
CMS-DP-2021-014; CERN-CMS-DP-2021-014.- Geneva : CERN, 2021 - 22 p. Fulltext: PDF;

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2021-04-29
12:26
FLUKA Run 2 simulation benchmark with beam loss monitors in the CMS forward region /CMS Collaboration
The FLUKA simulation framework is a general purpose Monte Carlo software for nuclear physics applications. It is commonly used by the CMS collaboration to make estimates on radiation levels in the underground cavern and at specific detector locations. [...]
CMS-DP-2021-008; CERN-CMS-DP-2021-008.- Geneva : CERN, 2021 - 6 p. Fulltext: PDF;

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2021-04-29
12:26
The Phase-1 Pixel Detector Performance in 2018 /CMS Collaboration
The upgraded CMS pixel detector was installed in the extended year-end technical stop of the LHC in 2016/2017. It consists of 124 million pixels arranged in four layers in the barrel region and three end-cap disks on each side of the barrel. [...]
CMS-DP-2021-007; CERN-CMS-DP-2021-007.- Geneva : CERN, 2021 - 19 p. Fulltext: PDF;

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